Window()

         Shows a window with optional title and shadow

    Syntax:

         Window( nY1, nX1, nY2, nX2, [cTitle], cBox, lShadow, ;
                  [cColor] ) -> Nil

         nY1     : Upper left Y coordinate
         nX1     : Upper left X coordinate
         nY2     : Lower right Y coordinate
         nX2     : Lower right X coordinate
         ctitle  : The title, optional
         cBox    : The box type
         lShadow : A logical value indicating shadowing
         cColor  : The color, optional

    Description:

         Draws a window at the given coordinates with optional title (no
         title if ctitle is Nil) and shadowed if lShadow is .T.. The color of
         the window is cColor or the active color is cColor is Nil.

    Return:

         Nothing.

    Example:

         Window ( 10, 15, 20, 25, "My title", "+-+|+-+| ", .T., "GR+/B" )